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After upgrading the Z-way server to version 3.0, we noticed very slow performance. We occasionally get a warning "Connection refused by the Z-way server". We didn't have any problems with the previous version!

Do you have a lot of connections to the UI (from mobile apps or from third party software)?

We are stopping our software. There are no connections to the UI. The problem is if we want to open websites http://89.212.162.78:8083/smarthome or http://89.212.162.78:8083/expert also. You can try that. Note: 89.212.162.78 is IP number of our Raspberry Pie.

If you donut across internet, it might happen that due to slow response the UI can complain about no connection. It should recovery once the signal is back.

Please check if it working Okey locally - is it as slow as via internet.

I would also not suggest to expose your Pi to the internet. Why not to use find service to protect the access to the UI?

We have the same problem locally. I opened the websites as localhost:8083/smarthome and localhost:8083/expet with the same results - Connection refused by the Z-Way server.

We found out where the problem was. We had to replace the SD memory card.